first galactose/rhamnose binding lectin domain found in Oncorhynchus keta CSL1-2, Silurus asotus RBL, Scomberomorus niphonius SML and similar proteins
The family includes a group of L-rhamnose-binding lectins, such as Oncorhynchus keta CSL1 and CSL2. CSL1 has hemagglutinating activity towards rabbit erythrocytes, but not human type B erythrocytes. CSL2 has hemagglutinating activity towards rabbit erythrocytes and human type B erythrocytes. Their hemagglutinating activities are inhibited by smooth-type lipopolysaccharide (LPS) from different bacterial species. The family also includes Silurus asotus rhamnose-binding lectin (RBL) and Scomberomorus niphonius L-rhamnose-binding lectin (SML). RBL, also known as Silurus asotus (catfish) roe lectin (SAL), is a lectin that binds L-rhamnose. It also binds monosaccharides possessing steric similarity to the hydroxyl group orientation at C2 and C4 of the pyranose ring structure of L-rhamnose, such as L-mannose and L-lyxose. RBL does not require a Ca2+ ion or free thiol group for its agglutination activity. SML is a rhamnose-binding lectin that also binds melibiose, raffinose, D-galactose, L-arabinose, D-fucose, maltose, and D-glucose with decreasing affinity. It does not bind D-arabinose, L-fucose, lactose, xylose or 2-deoxy-D-galactose. SML shows strong hemagglutinating activity against rabbit erythrocytes. CSL1-2 and SML contain two tandem galactose/rhamnose-binding lectin domains. RBL contains three galactose/rhamnose-binding lectin domains. This model corresponds to the first one.
Jiyao W et al.(2023). "The conserved domain database in 2023.",